Evaluate Excel VBA boolean condition (not a formula) - vba

Question

I have text in a cell A1 as below
((True And False Or True) And (True And (Not True))) And (False Or True)
I need to evaluate this text and put Boolean result (True / False) in another cell B1 using VBA code.
I tried to use Evaluate function, it is not working.
When I read this cell, it always return string type with double quote enclose in both side. Hence it is treated as string and not evaluating the Boolean expression.
"((True And True Or True) And (True And (True))) And (True Or True)"
I want to write this way, but it is not working
If Range("A1").Value = True Then
Range("B1").Value = True
Else
Range("B1").Value = False
End If
I tried to store in Boolean variable also
Dim Result as Boolean
Result = CBool(Range("A1").Value)
as it is string, I am getting type mismatch when I tried to convert using CBool.

Answer 1

You could try something like this, taking advantage of the Eval function in Access.
Public Function EvaluateExpression(Value As String) As Boolean
With CreateObject("Access.Application")
EvaluateExpression = .Eval(Value)
End With
End Function
Public Sub T()
Debug.Print EvaluateExpression("((True And True Or True) And (True And (True))) And (True Or True)")
End Sub
'True

Answer 2

Further to the accepted answer for this question you can use this code:
Option Explicit
Sub Test()
Debug.Print VBABooleanEvaluateOnTheFly("((True And False Or True) And (True And (Not True))) And (False Or True)")
Debug.Print VBABooleanEvaluateOnTheFly("((True And True Or True) And (True And (True))) And (True Or True)")
Debug.Print VBABooleanEvaluateOnTheFly("True")
Debug.Print VBABooleanEvaluateOnTheFly("False")
Debug.Print VBABooleanEvaluateOnTheFly("False Or True")
End Sub
Function VBABooleanEvaluateOnTheFly(strExpression As String) As Boolean
Dim blnResult As Boolean
Dim objVBComponent As Object
Set objVBComponent = ThisWorkbook.VBProject.VBComponents.Add(1)
With objVBComponent
.CodeModule.AddFromString "Function foo() As Boolean: foo = " & strExpression & ": End Function"
If Application.Run(.Name & ".foo") Then
blnResult = True
Else
blnResult = False
End If
End With
ThisWorkbook.VBProject.VBComponents.Remove objVBComponent
VBABooleanEvaluateOnTheFly = blnResult
End Function
You will need to tick the Trust access to the VBA project object model checkbox in the Trust Center settings.
Just to note a couple of things with this technique:
it is slow
there are likely a lot of ways it will break other things
it is vulnerable to code injection by a malicious user e.g. they may enter something like Sheet1.Cells.Delete instead of (True And False etc)

Answer 3

This is what you can do with VBA .Evaluate:
Option Explicit
Public Sub TestMe()
Dim cell01 As Range
Dim cell02 As Range
Set cell01 = Range("A1")
Set cell02 = Range("A2")
Range("A1") = "1+2+3+4+5"
Range("A2") = "TRUE and FALSE"
Debug.Print Evaluate(CStr(cell01))
'Debug.Print CBool(cell02) - this will be an error!
Debug.Print Evaluate(CBool("True") And CBool("False"))
Debug.Print Evaluate("=AND(TRUE,FALSE)")
Debug.Print Evaluate("=AND(TRUE,TRUE)")
Debug.Print Evaluate("=OR(TRUE,TRUE)")
End Sub
If you want to parse the TRUE and FALSE thing (commented in my answer), try to build a formula out of it and to evaluate it.
E.g., TRUE AND FALSE, should be translated to =AND(TRUE,FALSE). This gets evaluated easily by VBA as it is an Excel Formula. The translation is not a trivial task, but an interesting one.